Hypoxia can easily cause the decline of immunity; can cause insomnia, decline in reaction speed, memory decline; easy to lead to pulmonary heart disease, exacerbate hypertension, cause heart rate arrhythmia; stimulate the kidney, heart burden, induce myocardial infarction, cerebral thrombosis; cause liver dysfunction, liver fibrosis; lead to renal dysfunction. Make the whole body condition into a vicious circle of mutual influence. 

The harm of hypoxia to human beings and the clinical manifestations of mild hypoxia: fatigue, dizziness, loss of appetite, paleness, yawning, often feeling cold hands and feet. In shopping malls and subway, I feel chest tightness and shortness of breath. After a big exercise, I feel panic and shortness of breath. Moderate hypoxic manifestations: chest tightness, shortness of breath and shortness of breath above the second floor of the building; sedentary will feel backache. Sleep is not good, many dreams are easy to wake up, blood pressure, blood lipids, blood sugar is on the high side, resistance is weakened, susceptible to colds. High performance of hypoxia: usually feel chest tightness, shortness of breath, panic, increased activity. Heart often uncomfortable, will suddenly panic; memory loss, mental fatigue, fatigue. When standing up after squatting or sitting down, he is dizzy and dark in front of his eyes; temple pain, tinnitus, dazzling eyes, pale face. After getting up early, I feel back ache and backache and suffer from atherosclerosis. Acute hypoxia is characterized by dyspnea, cyanosis, loss of consciousness, and even coma.